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-rw-r--r--puppet/services/README.rst14
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diff --git a/puppet/services/README.rst b/puppet/services/README.rst
index 856b306e..6e4e9c1d 100644
--- a/puppet/services/README.rst
+++ b/puppet/services/README.rst
@@ -74,3 +74,17 @@ step, "step2" for the second, etc.
6) Start control-plane services
7) Any additional online migration tasks (e.g data migrations)
+
+Nova Server Metadata Settings
+-----------------------------
+
+One can use the hook of type `OS::TripleO::ServiceServerMetadataHook` to pass
+entries to the nova instances' metadata. It is, however, disabled by default.
+In order to overwrite it one needs to define it in the resource registry. An
+implementation of this hook needs to conform to the following:
+
+* It needs to define an input called `RoleData` of json type. This gets as
+ input the contents of the `role_data` for each role's ServiceChain.
+
+* This needs to define an output called `metadata` which will be given to the
+ Nova Server resource as the instance's metadata.